Ricoh A-P4, Service Manual

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• When performing this setting, cover the toner entrance hole with a piece of paper. This prevents
used toner falling from the PCU into the development unit during the TD sensor initial setting and
interfering with the Vref setting (toner density reference voltage).
9. Install the development unit in the machine.
10. Turn on the power switch, make sure that the machine has warmed up, then do the TD sensor
initial setting using SP 2-801.
11. After performing the TD sensor initial setting, remove the sheet [E] from the development
unit.
TD Sensor
1. Remove the development unit. (See ‘Development Unit’.)
2. Empty all developer from the development unit
3. TD sensor [A] ( x1)
• The TD sensor is attached to the casing with double-sided tape. Pry it off with the flat head of a
screwdriver. Use fresh double-sided tape to re-attach the sensor.
Development
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